A city planner believes that they should raise the speed limit on a local road from 25 miles per hour to 35 miles per hour. Using a car speed detectora random sample of 32 car speeds was selected. From this sample, the mean speed was overline x =31.2 with a standard deviation of s x =3 3. 6. Calculate a 95% confidence interval for the true mean speed of all cars that travel this local road. Assume the conditions for inference are met. A. 29.902 to 32.498 miles per hour    B. None of these is correct .      C. 29.454 to 32.946 miles per hour  D.  33.702 to 36.298 miles per hour

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